As a customer like you I am not familiar with prices. But $52k for a brand new 7ft Shigeru Kawai sounds surprisingly low to me. I thought they cost a lot more. But again, I'm not familiar with prices.
Note that many readers of this forum are piano dealers. So as far as I know a question like this seldom if not never gets answered to the satisfaction of the questioner.
I don't think customers like you and I are stingy. We hesitate to pull the trigger only because the piano prices are so nontransparent, not only for used pianos but also for brand new ones as well. We just hate to pay thousands more than another random customer for no good reason, that's all.
On the other hand, we have to admit probably not all dealers incur the same cost. For example, if a dealer maintains a large and beautiful showroom constantly having a few dozens high end pianos for us to try out in one visit, and opens 7 days a week, wouldn't it be fair for them to charge a somewhat higher price? The dealer is doing us customers a huge favor by simply maintaining such a showroom. Or if a dealer puts in extra effort in prep work, shouldn't they charge a higher price too? The problem again is, there is no easy way for a layman customer to distinguish all these fine detailed differences.
But if the only goal customers like you and I have in mind is to get the lowest possible price out there, then the inevitable consequence must be that we are collectively forcing all dealers to cut costs to an absolute minimum. How would a dealer compete with another dealer who, say does much less prep work?
In the end the only solution to this dilemma that I can think of as a customer, is to take our time looking, learning, comparing, waiting. Why rush to a decision so soon? Time is always on our side (unless the showroom closes down that's a whole different story). Visit a bunch of dealers repeatedly over a course of six months or even longer, play your favorite pianos and compare your feelings every time you visit. Check out various online resources and get familiar with all kinds of (asking) prices. Eventually the offer price should come down much closer to the "fair" price.